Inventor

HIRAI KEI

JP7 patents

⚠️ This page may combine multiple inventors who share the name “HIRAI KEI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

SUMITOMO ELECTRIC INDUSTRIES

3 patents

US12451407B2Oct 21, 2025

Composite material, semiconductor package, and method of manufacturing composite material

SUMITOMO ELECTRIC INDUSTRIES0 citations61

US12428585B2Sep 30, 2025

Coated super-abrasive grains, abrasive grains, and wheel

SUMITOMO ELECTRIC INDUSTRIES0 citations56

US12584204B2Mar 24, 2026

Steel wire

SUMITOMO ELECTRIC INDUSTRIES0 citations46

KUROSAWA KENSETSU KK

2 patents

US8882944B2Nov 11, 2014

Method for forming rustproof film on PC strand and PC strand

KUROSAWA KENSETSU KK0 citations38

US8833050B2Sep 16, 2014

Double rustproof PC strand

KUROSAWA KENSETSU KK0 citations36

SUMITOMO ELECTRIC HARDMETAL CORP

1 patent

US12467119B2Nov 11, 2025

Diamond sintered material and tool including diamond sintered material

SUMITOMO ELECTRIC HARDMETAL CORP0 citations59

KUROSAWA RYOHEI

1 patent

US8191251B2Jun 5, 2012

Method for forming rustproof film on a PC strand

KUROSAWA RYOHEI2 citations52